Basically, yes. The plot in the manga is based on the light novel. However, there can be some small changes in how the plot is presented. For example, in the manga, some scenes might be shown more briefly or with a different visual focus compared to how they are described in the light novel, but the overall plot remains the same.
Yes, it has a very similar plot. The manga is an adaptation of the light novel, so it follows the same general storyline with the same main events and character arcs.
Mostly, it does. The manga aims to bring the story of the light novel to a visual medium. So, the main plot elements like the protagonist's reincarnation, his attempts to better himself in this new world, and his interactions with other characters are all there as in the light novel. There may be some slight deviations in terms of pacing or the exact sequence of some minor events, but the core plot is the same.
Chapter 377, "Master Above, Please Accept Your Disciple's Bow", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter gives readers a real answer by opening on Tell me what it is that you came to ask of me this time?" After...
Chapter 562, "So You Are Not First, But Last?!", is the clearest early answer because it turns Ai Xiaochun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After they finished preparing the fish, Guo Xing and Luo Xuan got...
Chapter 907, "Disgusting Clothes", is the clearest early answer because it turns Disgusting Clothes Zhao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang originally thought this little kid was just casually saying...
Chapter 812, "You’re Extorting Money!", is the clearest early answer because it turns Jiang Mingchuan's situation into a concrete plot event.
Chapter 715, "Childhood Shadow", is the clearest early answer because it turns Childhood Shadow Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Mingyu let out a long sigh before collapsing onto the sofa,...
Chapter 584, "The Wealthy Young Master Renounces Worldly Life for Love", is the clearest early answer because it turns Life's situation into a concrete plot event. Early on, There wasn't a mirror on the small boat..
Chapter 452, "Party of Four", is the clearest early answer because it turns Party's situation into a concrete plot event.
Chapter 568, "Not at All", is the clearest early answer because it turns Crown Prince's situation into a concrete plot event.
Chapter 374, "From Now On, Jiang Li Calls the Shots in Golden Sand!", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li's bold behavior infuriated Jin Siyue, but it also succeeded...
Chapter 460, "Saving People", is the clearest early answer because it turns Saving People's situation into a concrete plot event. The chapter gives readers a real answer by opening on [HAHAHAHAHAHAHA, Jiang Yan is impersonating me.] [At this moment, I...